Insulating unit for electric suspension-chains



L. E. T. PERRIN INSULATING UNIT FOR ELECTRIC SUSPENSION CHAINSAPPLICATION FILED OCT. 22, I920.

1,391 ,57 6. Patentedsept- 20, 1921.

.provements PATENT OFFICE.

UNITED STATES LUCIEN "EMILE 'rnnononn PERRIN, or rams, FRANCE.

"INSULATING UNIT FOR ELECTRIC susrnnsion-oimins.

Specification of Letters Patent. Patented Sept, 20, 1921, Applicationfiled October 22, 1920. Serial No. 418,864.

- (GRANTED UNDER THE PROVISIONS OF THE ACT OF- MARGH' 3, 1921, 41 STAT.L, 1313.) a

To all coh'omit'may concern.

Be it known that I, LUomN EMILE T1-1i'1o- DORE PERRIN, a citizen of theFrench Republic, of 4E1" Rue de Chateaudun, Paris, France, has inventednew and useful Imin Insulator. Units for Electric Suspension-Chains,"(for which I have filed applications in France August 1, 1919, PatentNo. 516,996 and in France October 2, 1920,) of which thefollowing is aspecification. Y

The subject of the present invention is an insulator unit for use in thecomposition of electric suspension chains for high tension lines.

The metal which enters into the fabrication of the other devices of thiskind at present in-use, and which is always detrimental, is avoided inthe construction of the insulator unit hereafter to be described, andthe assembling of the several units composing a chain is effected by thesimple process of screwing, no sealing being necessary.

In the annexed drawings- Figure 1 shows an elevation and part section ofan insulator unit constructed accordin to the present invention.

*ig. 2 shows the manner in which several such units may be assembled toform a suspension chain.

Fig. 3 is a sectional view of a unit taken on line 3-3 of Fig. 1. g

The insulator unit (Fig. 1) is composed of an insulator of porcelain 1of suitable shape. In the lower part of this insulator is a cavity 2 thesides of which are fitted with a screw thread and the bottom curved outin the shape of a segment of a sphere. Inside the cavity 2 is screwed asleeve 3 made of some strong, non-conducting material. The lower part ofthe insulator sleeve 3 is provided with a rectangular hole 1. Aninsulator stem 5, also made of some nonconducting material of sufficientmechanical strength passes through the hole 1 and terminates in aspherical insulator ball 6 which rests on the sleeve 3 in such a waythat it is able to oscillate inside the cavity 2 intowhich it fits. Thestem 5 is finished at the lower end by a screw thread 7 on the outside,while the upper part of the porcelain insulator 1 is fitted on theinside with a screw thread 8 which, when the insulator units forming thechain are assembled, receives the screwed end of the stem of the unitimmediately above it, I

The object of the rectangular hole 4 is to allow the sleeve3 to bescrewed into the cavity 20f the insulator 1 .by means of a specialspanner. Moreover, a hole 14; in the sphere 6 allows for the screwing or'unscrew- 7 111g, with a suitable tool, of the stem 5 in the cavity 8 ofthe insulator situated immediately below. This hole may be placed toequal advantage anywhere else on the stem 5.

It will thus beseen that the fittingtogether and assembling of thevarious units are conducted with the utmost ease and rapidity.

It may be pointed out that with this method of assembling the insulatorparts with the porcelain parts nospace is left in which air or watermight find a refuge; all

the parts are screwed solid, leaving only just the play necessary forthe insulator ball inside the porcelain to oscillate freely.

Fig. 2 represents a suspension chain formed of insulator units similarto those described above,

The principal part of the chain, c'. 6., that part comprised between thepoints 9 and 10,

is composed of insulator units and contains no metal. At the top of thechain an insulator stem 11 is screwed to the upper part of the firstporcelain insulator and connects the chain to a metal spherical balljoint 12 by one of the usual devices. In the same way the lower part ofthe stem 5 of the last insulator unit connects the chain in the usualmanner to a metal spherical ball joint 13.

It should be observed that the method of fitting described above may beapplied to any type of suspension chain used on high tension lines; theshape of the porcelain insulator alone varies according to the positionthe chain is intended to occupy on the high tensionline (running chains,dead endings,

curved chains, etc.)

It is to be noted that in the above def scribed case, the porcelain issubmitted to tension, butof course the invention could be applied to anyform' of insulator unit which would be submitted to compression strains.

What I claim is:

1. Insulator unit for electric suspension chains on high tension linescomprising a porcelain part, a cavity in the lower end of this part, asleeve made of some nonconducting material of great mechanical strengthinside this cavity, a rectangular hole in the lower part of the sleeve,a stem made of the samenonconducting material as the sleeve the lowerend of which is threaded while the upper end passes through the saidrectangular hole, a spherical ball made of the same nonconductingmaterial as the stem at the top of the said stem and rest ing on thesaid sleeve inside the said cavity, and a cavity in the top of theporcelain part fitted with a screw thread of the same diameter as thesaid stem.

2. Insulator unit for electrical suspension chains on high tension linescomprising a porcelain part, a cavity in the lower end of this part, ascrew thread inside this cavity, asleeve made of some nonconductingmaterial of great mechanical strength inside the said cavity, a screwthread on the outside of this sleeve corresponding to the screw threadinside the cavity, a rectangular hole in the lower part ofthe sleeve, astem made of the same nonconducting material as the sleeve the lower endof which is threadedrectangular hole, a spherical ball made of thesame'nonconducting material as the stem at the top of said stemandresting on the said sleeve inside the said cavity, and a cavity in thetop of the porcelain part fitted with a screw thread of the samediameter as the said stem.

3. An insulator unit for. electrical suspension chains on high tensionlines comprising a porcelain part having a cavity inits lower end, asleeve of noirconducting material secured in said cavity, and a stem ofnon-conducting material having a threaded lower end and a sphericalballiat its upper end, the ball being located in the'cavity and restingon said sleeve and the stem passing through said sleeve, the upper endof the porcelain part being provided with a cavity having a threadedwall designed to engage the threaded stem of another unit.

In witness whereof I have hereunto set my hand.

L. PERRIN.

